Means for electrically marking upon metals



W, S. OVERLFN.

MEANS FOR ELECTRCALLY MARKING UPON METALS.

MMM

Patented Aug. 24, 1920u EEE .Il a

' To all whom it may camera;

WILLIAM S. OVEBLIN, OF PORTLAND, OREGON. IBANSJ'OE ELECTBICALLY MARKING UTON METALS.

Speoioation ot Letten Patent.

Be it known that I, WILLIAM S. a citizen of the United States, residing at Portland, in the county of Multnomah and State of Oregon, have invented new and useful Improvements in Means for Electrically Marking Upon Metals, of which the followlng' is a specification.

is invention 'relates `to means for writing 0r marking upon metal bythe aid of the electric current, and consists broadly in the combination of an electro-magnet having a spring armature carrying the pen or mar 'ng point, and an electric circuit which includes the coil of the magnet, the markingl point, and the metal to be inscribed.

A convenient way of constructing the implement is to form the spring armature of an extension from the wire of the coil itself, so that the marking point is in series with said coil; the work may be directly connected in the circuit or simply laid on a block of metal which is in the circuit.

Instead of the electro-magnet, a solenoid may be used, the core of which carries the marking point; the core may be moved in one direction by a spring or the solenoid may be double so as to alternately attract the core in opposite directions. In all cases, the marking point must be in the circuit` so as to rapidly make and break the contact between it and the work, or metal to be inscribed.

I am aware that I am not the first to devise means for marking upon metal electrically, but I believe that I have devised a much simpler and more practical means Afor that purpose.

As I at present construct it, my device is known as the electric-pen and isespecially intended for the use of mechanics in machine shops and garages in marking for identification their tools and parts of machines.

In the accompanying drawing I have illustrated my invention as embodied in this electric pen, although I do not intend to necessarily limit its use to such embodiment.

Application led November 24, 1919. Serial OvnmN, l

Patented Aug. 24, 1920. N 0. 340,175.

Figure 1 is a in u se;

Fig. 2 is a central longitudinal section of the pen, and I 1g. 3 is a central lon itudinal io f a modified form. g sect n o e pen of Figs. 1 and 2 consists essenti' a ly of a co1l of wire 10, the convolutions of w ich are sultably insulated from cach other perspective view of the'pen c osed in a sultable sheath which th use.

The upper end of the wire has a terminal which it is connected to th while the lower end is extended at 16,1s bent upon itself at 17, andv brought back 1nto the axisfof the coil where it is connected to the holder 18 for the marking point 20.

The coil can be made of comparatively insulated by immerslon 1n shellac, the core being insulated in the same way, while the marking point may be of copper or, if desired, of a harder and more durable metal, such as platinum.

30 represents the piece of metal to be written upon or marked; it is includedfin the c1rcu1t either by connecting the wire to it or by laylng it on a block of metal which 1s in the circuit. The other terminal of the circuit, which includes a battery of about six cells, or other suitable source of electricity, is connected to the terminal 14 of the coil.

In operation, as soon as the point touches the metal piece 30, the circuit is closed, the coil .b armature, whereby the circuit is broken again and, the operation repeating itself continuously, a constant rapid sequence of sparks is formed at the point of contact which have the effect, ,whenl the pen is moved over the metal surface, as in writing of tracing a practically continuous line.

Fig. 3 shows a solenoid 40, the core 41 of which carries the marking point and is projected outward from the coil by a spring 42, suitably secured within the coil. Wire Having thus cescrbed. my invention,

what claim ist AAn eeczrlc penq compmsmg e. core, e Wwe celled around saldi core means to colmnecrJ veofzfee one end m' Seidl Wire to en eectric circuit, lo

the other end of seid wire being bent outJ and beck to om e spring, am a marking point carried by the end of seid spjng portion of the Wire.

h1 testimony whereof 1i have herento set 15 my hm.

WHJLEAM S. VERLEN 

